Dolphin has GLSL shaders built in to the OpenGL backend. You do not need sweetFX in the first place, if you use the OpenGL backend, which is currently the one you SHOULD be using, iirc.
You may not be able to use multiple shader files, but you can merge multiple into a single file. Just, don't ask me how to do that, I'm not some kind of know-all-language programming wizard.
If you absolutely need a certain shader that's provided with sweetFX but not with dolphin, just port it. They're both GLSL, it shouldn't be too hard, if anything more than a cakewalk. I'm not an expert on this, at all, but I'd say it'd probably be as simple as copying all of the code, and then making it not rely on the external configuration file from sweetFX, which would be a matter of constants. At most, you'd have to change some code to make it compatible, but again, I'm not an expert on this.
You may not be able to use multiple shader files, but you can merge multiple into a single file. Just, don't ask me how to do that, I'm not some kind of know-all-language programming wizard.
If you absolutely need a certain shader that's provided with sweetFX but not with dolphin, just port it. They're both GLSL, it shouldn't be too hard, if anything more than a cakewalk. I'm not an expert on this, at all, but I'd say it'd probably be as simple as copying all of the code, and then making it not rely on the external configuration file from sweetFX, which would be a matter of constants. At most, you'd have to change some code to make it compatible, but again, I'm not an expert on this.
in a perfect world we would all be piles of sand with no ability to form coherent bodies of body